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  Atomic-scale investigations of isothermally formed bainite microstructures in 51CrV4 spring steel

Goulas, C., Kumar, A., Mecozzi, M.-G., Castro-Cerda, F. M., Herbig, M., Petrov, R., et al. (2019). Atomic-scale investigations of isothermally formed bainite microstructures in 51CrV4 spring steel. Materials Characterization, 152, 67-75. doi:10.1016/j.matchar.2019.03.038.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0003-ACDB-5 Version Permalink: http://hdl.handle.net/21.11116/0000-0003-ACDC-4
Genre: Journal Article

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 Creators:
Goulas, Constantinos1, 2, Author              
Kumar, Ankit3, Author              
Mecozzi, Maria-Guiseppina1, Author              
Castro-Cerda, Felipe Manuel4, Author              
Herbig, Michael5, Author              
Petrov, Roumen6, 7, Author              
Sietsma, Jilt8, Author              
Affiliations:
1Delft University of Technology, Department of Materials Science and Engineering, Mekelweg 2, 2628CD Delft, The Netherlands, ou_persistent22              
2Materials innovation institute (M2i), Electronicaweg 25, 2628XD Delft, The Netherlands, ou_persistent22              
3Materials Science of Mechanical Contracts, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_2324693              
4Department of Metallurgical Engineering, Universidad de Santiago de Chile, Av. Lib. Bdo. OHiggins 3363 Estacion Central, Santiago de Chile, Chile, ou_persistent22              
5Materials Science of Mechanical Contacts, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_2324693              
6Delft University of Technology, Department of Materials Science and Engineering, Mekelweg 2, CD Delft, Netherlands, ou_persistent22              
7Ghent University, Department of Materials Science and Engineering,Tech Lane Ghent Science, Park-Campus A, Technologiepark 903 Zwijnaarde, Ghent, Belgium, ou_persistent22              
8Technische Universiteit Delft, Mekelweg 5, 2628 CD Delft, The Netherlands, ou_persistent22              

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Free keywords: Atoms; Austenite; Bainite; Bainitic transformations; Binary alloys; Carbides; Carbon; Chromium alloys; Chromium compounds; Ferrite; High resolution transmission electron microscopy; Inverse problems; Isotherms; Microalloyed steel; Probes; Transmission electron microscopy; Vanadium alloys; Vanadium steel, Atom probe tomography; Austenite decomposition; Bainite Start Temperatures; Cottrell atmospheres; Isothermal transformations; Isothermal treatment; Lower temperatures; Spring steel, Chromium stee
 Abstract: Atomic-scale investigation was performed on 51CrV4 steel, isothermally held at different temperatures within the bainitic temperature range. Transmission electron microscopy (TEM) analysis revealed three different morphologies: lower, upper, and inverse bainite. Atom Probe Tomography (APT) analysis of lower bainite revealed cementite particles, which showed no evidence of partitioning of substitutional elements; only carbon partitioned into cementite to the equilibrium value. Carbon in the bainitic ferrite was found to segregate at dislocations and to form Cottrell atmospheres. The concentration of carbon remaining in solution measured by APT was more than expected at the equilibrium. Upper bainite contained cementite as well. Chromium and manganese were found to redistribute at the cementite-austenite interface and the concentration of carbon in the ferritic matrix was found to be lower than the one measured in the case of lower bainite. After isothermal treatments close to the bainite start temperature, another austenite decomposition product was found at locations with high concentration of Mn and Cr, resembling inverse bainite. Site-specific APT analysis of the inverse bainite reveals significant partitioning of manganese and chromium at the carbides and at the ferrite/martensite interfaces, unlike what is found at isothermal transformation products at lower temperatures. © 2019

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Language(s): eng - English
 Dates: 2019-03-292019-06
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1016/j.matchar.2019.03.038
 Degree: -

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Title: Materials Characterization
  Abbreviation : Mater. Charact.
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: -
Pages: - Volume / Issue: 152 Sequence Number: - Start / End Page: 67 - 75 Identifier: ISSN: 1044-5803
CoNE: https://pure.mpg.de/cone/journals/resource/954928499483